Lifting-jack.



W; McH.-ALSTON & IfEuHINDMAN.

LIFTING JACK.

APPLICATlON men JAN. 26. ISIS.

Patented July 20, 1915.

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WM IIIIIIIIIIIII HIHHIIHIIHYIHIIIIHHIIIHIIIIIIHHHHEIHHEUI llllllllllll Q 1 V Y A WITNESSES W. McH. ALSTON & l. E. HINDMAN.

LIFTING JACK. APPLICATION FILED 1Au.26. 1.915.

' Patented July- 20, .1915,

BEST AVAILABLE COPY WALTER McH. ALSTON,

SYLVANIA, ASSIGNORS TO THE DUFF or BEN AVON, Ann IsAiAH E. HINDMAN,

or OAKMONT, PENN- MANUFACTURING COMPANY, or rn'rs- IBUBG-H, PENNSYLVANIA, A CORPORATION OF PENNSYLVANI LIFTING-JACK.

Specification of Letters Patent.

Application filed January 26, 1915. Serial No. 4,449.

To all whom it may concern Be it known that we, WALTER McH. AL- STON and ISAIAH E. HINDMAN, both citizens of the United States, residing, respectively, at en of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Lifting-Jacks, ing is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is a View partly in side elevation and partly in vertical section showing our invention applied to one form of jack; Fig. 2 is a plan view of the operating mecha nism; Fig. 3 is a sectional elevation of the same; and Fig. 4 is a view similar to Fig. 3, but showing the operating devices reversed.

Our invention has relation to lifting jacks,

and more particularly .to the actuating mechanism therefor.

he invention is particularly applicable to lever-operated jacks, and is designed to provide means whereby the action ofthe jack may be readily reversed by manipulation of the actuating lever.

Lifting jacks are often used in places, as, for instance underneath automobiles, where it is more or less inconvenient to get at the jack for the purpose of reversing its action. Our invention provides means of simple character whereby this reversal can be effected from a point outside the structure or machine in connection with which the jack is being used.

The particular form of jack illustrated in the drawings forms no part of the present invention, but is described and claimed in our copending application Serial No. 4450 filed January 26, 1915. The invention is not limited in its application to this particular form of jack, which isshown for the purposes of illustration only.

In the accompanying drawings, the numeral 2 designates the frame of the jack, 3 the vertically movable lifting bar, 4 the rest, 5 a supplemental rest. 6 apinion shaft carry- I ing a pinion 7 for engagement with the. usual nected with the shaft bar. 8 a worm wheel actuated by a '.'.-'orm bra kc disk adapted rack teeth on the lifting on said shaft 6, which is on the shaft 9, and 10 a to be automatically connected and .,l,I$C=")ll- 9 through Lil-. medium.

Avon and at Oakmont, in the county of which the follow- 9 of the clutch members 11. 12 designates spring-actuated brake shoes which'cooperate with the disk. These parts, as above stated, form no part of the present invention.

3 is a lever socket, which is bifurcated at its forward end, the bifurcated portions loosely engaging one end portion of the shaft Fixedly secured to said shaft within the bifurcated portion of the lever'socket is a Wheel 14. Rotatably journaled in said lever socket adjacent to the periphery of the wheel 4 is a cam pawl of the following construction. This pawl has two eccentric cam portions 15 and 16 either one of which is adapted to contact with the periphery of the wheel 14. At the opposite-side, it has the teeth or projections 17 and 18, each of which has an inner beveled face 19. At its lower side, it has a double beveled tooth for engage- Patented July 20, 1915.

ment with a spring-pressedlocking pin 21.

manually turned to reverse 23 designates a lever having an end por tion 24, adapted to enter the socket portion of the lever socket,and having at its ex.- treme inner end a projection 25, having a beveled surface 26.

he operation is as parts are in the position shown in Fig. 3, the cam portion 16 of the cam pawl is in engagement with the periphery of the wheel 14, and when the lever 23 is moved downwardly, said pawl acts upon the wheel to rotate it in the direction indicated by the arrow in said figure. Upon the upstroke of the lever 23, the contacting surface of 16 turns idly on the periphery of the wheel 14. In order to prevent slippage between these contacting surfaces, they are preferably toothed or serrated, as indicated. in this oyjierative position by the spring ressed locking pin 21, which engages one side of the tooth 20. When it desired to reverse the jack by means of the lever 23, the latter is withdrawn from the socket of the lever socket and is reinserted tl'iercin in reversed position. as shown in Fig. 4. As it is inserted into the socket in the reverse position, its beveled surface 26 contacts with the beveled surface 19 of t e projection 17, and rotates the cam pawl in the direction indicated by the arrow in Fig. 4. This e cam pawl is held .1,ll7,l7 6 action turns the pawl a sufficient distance to portions and the lever having means which, throw the beveled point of the pin 21 to the as it is inserted in its socket, engages with other side of the tooth 20, and 'when this oneof said actuating portions in each of its occurs the action of'the spring 21? of said reverse positions to thereby reverse the pawl, 65 pin imparts a still further movement to said together with means for holding the pawl awl to bring it to the position shown in in its reversed positions, substantially as said figure. To again reverse the jack, the described. lever is withdrawn and'reinserted in the 4. A lifting jack having a reversible acposition shown in Fig. 3, when the action of tuating pawl and a detachable reversible le- 7o 10 the cam face 26 upon the beveled face 19 of ver, said pawl and lever having coacting the tooth 18, cooperating with the spring pin portions for effecting the reversal of the 21, will cause the return of the pawl to the pawl, together, with spring-actuated holding position shown in said figure. It will be means for the pawl, substantially as dereadily understood that any suitable gearscribed. 75

ing for actuating the lifting bar may e 5. A lifting jack having a reversible acconnected to the shaft 6. a tuating pawl and a detachable reversible le- 'The advantages of our invention will be ver, said pawl and lever having coacting apparent, since it provides a jack-actuating portions for efieeting the reversal of the lever, by means of which the jack can be pawl, together with a spring-actuated holdso 20 reversed, as described, without the necessity ing device arranged to exert a turning and for getting at the jack itself and through also a holding action on the pawl, substanthe medium of said lever. tially as described.

We do not desire to limit ourselves to the 6. A lifting jack having a lever socket, a particular construction and arrangement of reversible lever detachably engaging said as the parts constituting our invention as heresocket and adapted to be received therein in in shown and described, as it is obvious that either of two positions, and an actuating the form of the cam pawl may be changed pawl pivotally mounted on the lever socket, and that changes may be made in the form said pawl and lever having cam portions and construction of the lever socket and of which engage each other when the lever is W .30 the actuating lever, without departing from inserted in its socket in both positions of the the spirit and scope of our invention as delever to thereby move the pawl on its pivot fined in the claims. I and reverse it, substantially as described.

We cla m: 7. A lifting jack'having an actuating le- 1. A l fting ack comprising a lift ng ver, a reversible cam pawl journaled on 95 bar, gearing connected to the lifting bar, a said lever and provided with beveled faced reversible pawl member for actuating the projectionaand a reversible lever having a gearing, and a lever mounted to oscillate in beveled portion adapted to engage the beva vertical plane, sa d lever being reversible eled faces of said projections when the lever edgefor edge, and the lever and pawl hav- .is inserted in its socket to thereby effect a mo 40 mg portions which engage each other .in reversing movement of the pawl, substandifierent positions of the lever as the lever tially as described. is inserted in its socket to thereby reverse 8. A lifting jack, having a lever socket, a the pawl, substantially as describe reversible pawl carried by said socket, a le- 2. A lifting ack having an actuating le-, ver adapted to enter said socket in either its ver mounted to oscillate in a vertical plane, one of two positions, and means on the said lever being reversible edge for edge, an socket-entering end portion of the lever actuating pawl carried by said lever and which, when the lever 'is inserted in the hav ng two actuating portions, the lever socket in one'position, contacts with and having means for engagingone of said acthereby throws the pawl in one direction, 116

tuating portions in one of its pos t ons, to and when the lever is inserted in its other pothereby throw the pawl in one position and sition, contacts with and thereby throws the also to engage the other of said actuating pawl to its reverse position; substantially as portions in the other position of the lever to described.

. therebytlirow the pawl to its reversed posi- In testimony whereof, "we have hereunto Ill 1E tion, said means being operative by the enset our hands.

traaice ofbtlae lever to its socket, substantially WALTER ALSTON as escrie. a A lifting jack having a reversible ac- ISAIAH HINDMAN- tuating p'awl and a detachable reversible ac- Witnesses:

t0 tuating lever mounted to oscillate in a ver- GEO. A. Youne, tical plane, said pawl having two actuating JACOB Wrrrrmn.

@epiee of this patent may be obtained for five cents each, by addressing the commissioner of Patents.

Washington, D. c." 

